Hi

Other than the general eligibility criteria , the other criteria to be eligible for AAT is that the candidate should have attempted and qualified JEE Advanced 2021. So if you have qualified JEE advanced then you are eligible make sure you meet other criterias as well.

JEE architecture aptitude exam which is scheduled on 18th October is for admission to B.Arch offered by  IIT roorkee and IIT kharagpur.

For more details

https://engineering.careers360.com/articles/jee-advanced-aat

Hope this clarifies!